Method of Moment Thin Wire Computer Program Comparisons for Complex Structures and Coarse Accuracy.

摘要

Recently developed numerical methods have been applied successfully to performance prediction of antennas in complex scattering environments. The general framework for these techniques, at frequencies for which the antenna is at most a few wavelengths, is the method of moments (moment method) as set forth by Harrington (Harrington 1968). Many computer programs have been developed, based on the moment method. A number of them are applicable to solving antenna problems of quite arbitrary geometries. In particular the programs based upon thin-wire modeling are applicable. Not all antennas are collections of thin wires, however. Hence, there are two concerns regarding these methods: (a) the accuracy of the model, and (b) the accuracy of the analysis of the model. An accurate model is one which exhibits all important aspects of the actual antenna. This accuracy can be gauged either by (1) comparison with experiment or other analysis if results from these exist, or (2) continuously increasing the complexity of the model (add wires, for example) until computed parameters such as driving point impedance, radiation pattern, or current show little change. Gauge (2) is a convergence test. An accurate model analysis, on the other hand, is not related to the relevance of the model, but rather to the accuracy with which an analytical tool predicts important model parameters.